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STK401-010 데이터시트(PDF) 4 Page - Sanyo Semicon Device

부품명 STK401-010
상세설명  AF Power Amplifier (Split Power Supply) (30 W 30 W min, THD = 0.4%)
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제조업체  SANYO [Sanyo Semicon Device]
홈페이지  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

STK401-010 데이터시트(HTML) 4 Page - Sanyo Semicon Device

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No. 4343-4/9
STK401-050
Description of External Circuits
C1, 11
For input coupling capacitor. Used for DC current blocking. When capacitor reactance with low
frequency is increased, the reactance value should be reduced in order to reduce the output
noise from the signal resistance dependent 1/f noise. In response to the popping noise which
occurs when the system power is turned on, C1 and C11 which determine the decay time
constant on the input side are increased while C3 and C13 on the NF side are decreased.
C2, 12
For input filter capacitor. Permits high-region noise reduction by utilizing filter constructed with
R1 and R11.
C3, 13
For NF capacitor. This capacitor determines the decline of the cut-off frequency and is
calculated according to the following equation.
fL =
1
2
π X C3 (13) X R3 (13)
For the purpose of achieving voltage gains prior to reduction, it is best that C3 and C13 are large.
However, because the shock noise which occurs when the system power is turned on tends to
increase, values larger than those absolutely necessary should be avoided.
C5, 15
For oscillation prevention capacitor. A Mylar capacitor with temperature and frequency features
is recommended.
C6, 7
For oscillation prevention capacitor. To ensure safe IC functioning, the capacitor should be
installed as close as possible to the IC power pin to reduce power impedance. An electrolytic
capacitor is good.
C8, 9
For decoupling capacitor. Reduces shock noise during power up using decay time constant
circuits with R8 and R9 and eliminates components such as ripples crossing over into the input
side from the power line.
R1, 11
For input filter applied resistor.
R2, 12
For input bias resistor. The input pin is biased to zero potential. Input impedance is mostly
decided with this resistance value.
R3, 13, 4, 14
For resistors to determine voltage gain (VG). We recommend a VG = 40 dB using R3 and R13 =
560
Ω and R4 and R14 = 56Ω. VG adjustments are best performed using R3 and R13. When
using R4 and R14 for such purposes, R4 and R14 should be set to equal R2 and R12 in order to
establish a stable VN balance.
R5, 15
For oscillation prevention resistor.
R6, 16
For oscillation prevention resistor. This resistor’s electrical output resides in the signal frequency
and is calculated according to the following formula.
P R6 (16) =
(
VCC max/
√2
)
2
X R6 (16)
1/2
π fC5 (15) + R6 (16)
f = output signal frequency upper limit
R8, 9
For ripple filter applied resistor. PO max, ripple rejection and power-up shock noise are modified
according to this value. Set the electrical output of these resistors while keeping in mind the flow
of peak current during recharging to C8 and C9 which function as pre-drive TR control resistors
during load shorts.
L1, 2
For oscillation prevention coil. Compensates
phase dislocation caused by load capacitors
and ensures stable oscillation.


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